John, it was always about more subwoofer channels.
Now there is a way for 2+2+2 with only a analogue 4 port card added to the standarx digital outs on a 861v6

Prologic IIz also did not exist.

But perhaps I am the only idiot out here that would implement it if it were possible.
That is the reason of the question..

Sold all M equipment